import math

class Circle:
    def __init__(self,radius):
        self.radius = radius

    def get_perimeter(self):
        return 2 * math.pi * self.radius

    def get_area(self):
        return math.pi * self.radius ** 2

circle = Circle(radius=3)
print("圆的周长为:",circle.get_perimeter())
print("圆的面积为:",circle.get_area())